MDD profoundly affects the individual, their family and wider society, with effects across quality of life domains including mental health, relationships, functioning, and engagement with activities of daily living.
Several studies have established the overall burden of MDD. In one 12-month prospective study, patients with MDD had a nearly 5-times greater risk of disability compared to asymptomatic individuals.
A longitudinal quality of life study in over 1,000 patients with MDD from France, Germany, Spain, Sweden and the UK reported:
Severely impaired SF-12 mental health score (MCS) in MDD patients compared to other common chronic diseases (MCS 26.5 vs. 50)
A strong association between patient-assessed depression severity (PHQ-9) and quality of life impairment (p<0.001 for SF-12 MCS)
* Quote is adapted from a comprehensive examination of the reported problems and or the questions asked by users of an online depression support forum.
MCS, mental component summary score. MDD, Major depressive disorder. PHQ-9, Patient Health Questionnaire-9. SF-12, 12-Item Short Form Survey.